MIL-DTL-83538 Connectors And Accessories, Electrical, Circular, Umbilical, Environment Resistant, Removable Crimp Contacts For Mil-Std-1760 Applications \(Metric\), General Specification ForThis specification covers connectors and accessories, electrical, circular, umbilical. The connector assembly provides the necessary connections required to meet MIL-STD-1760, class I electrical interface between stores and their associated launchers using a "blind mating" mechanism. The connector assembly consists of a receptacle installed on the launcher, a receptacle installed on the store, and a buffer plug installed between the two receptacles. This specification also includes the required mounting adapters and nut, accessory adapter, cable bushing, and protective covers \(see 6.1 for details on intended use and application\). The connectors covered by this specification are intended for use with launcher mechanisms with an applied holding force in the range 271 Newtons \(61 lbs\) to 427 Newton \(96 lbs\).

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MIL-DTL-83538D

3.29 Ozone. When tested as specified in 4.6.25, the connectors shall show no evidence of cracking of

dielectric material or other damage due to ozone exposure that will adversely affect performance.

3.30 Fluid immersion. When tested as specified in 4.6.26, connectors shall meet the requirements for

coupling torque (see 3.8) and dielectric withstanding voltage (see 3.12).

3.30.1 Retention system fluid immersion. When tested as specified in 4.6.27, the insert assemblies

shall meet the requirements of contact retention (see 3.18). Effects of the fluids on resilient sealing

members shall not be a consideration of this test.

3.31 Contact walkout. When tested as specified in 4.6.28, contacts shall not become dislodged from

their normal position.

3.32 Installing and removal tool abuse. Qualifications only. When tested as specified in 4.6.29, there

shall be no evidence of damage to the contacts, the connector insert, or the contact retaining mechanism.

3.33 High temperature exposure. See 4.6.30.

3.33.1 High temperature exposure with contact loading. When tested as specified in 4.6.30.1, the

contacts shall maintain their specified locations as shown (see 3.1) and there shall be no electrical

discontinuity.

3.33.2 High temperature exposure for connectors. When tested as specified in 4.6.30.2 for 1,000

hours, connectors shall perform satisfactorily and pass succeeding tests in the qualification test

sequence.

3.34 Electrolytic erosion. When tested as specified in 4.6.31, pin contacts shall show no exposure of

base metal due to electrolytic erosion. Corrosion deposits shall not be considered as defects.

3.35 Icing and freezing rain. When tested as specified in 4.6.32, the connector assembly shall

withstand the icing and freezing rain environment (sea spray condition) specified in 4.6.32. The force

required to separate the connector shall not exceed 334 Newtons (75 pounds).

3.36 Sand and dust. When tested as specified in 4.6.33, the connector assembly shall withstand the

blowing dust and blowing sand conditions of MIL-STD-810, method 510. Blowing dust air velocity shall

be 8.9 meters/second minimum. The blowing sand air velocity shall be 29 meters/second minimum with

a sand concentration of 2.2 �0.5 grams/cubic meter. Immediately following this exposure, the coupling

force and decoupling force shall not exceed the requirements specified herein (see 3.8.2 and 3.8.3) by

more than 25 percent.

3.37 Launcher drive pin strength. Applies to MIL-DTL-83538/4 receptacle only. When tested as

specified in 4.6.36, the launcher drive pins shall show no evidence of permanent deformation or damage

such as would impair the operation of the connector or launcher mechanism.

3.38 Lightning strike. Not applicable to the MIL-DTL-83538/11 buffer plug. The connector set shall

show no damage or degradation in performance, including seizing, pitting, or damage to the insulation of

the connector when subjected to the lightening strike requirements specified in 4.6.38. Connectors shall

be mated and unmated in accordance with the requirements of 3.8.1 and 3.8.3 without recourse to tools,

except for MIL-DTL-83538/12. Failure to unmate the connectors because they have welded together

shall constitute a test failure.